Dielectric and Microwave Properties of Graphene Nanoplatelets /Carbon Black Filled Natural Rubber Composites

Al‐Hartomy, Omar A.; Al‐Ghamdi, Ahmed A.; Al-Salamy, Falleh; Dishovsky, Nikolay; Shtarkova, Rossitsa; Iliev, Vladimir; El-Tantawy, Farid

doi:10.5923/j.ijmc.20120203.06

Cited by 35 publications

(30 citation statements)

References 34 publications

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“…All of these factors during deformation contribute to the formation of a network structure containing cross-linked chemical chains, nanofiller, and crystallizable networks in the NR/filler nanocomposite. Dishovsky et al [7] have reported that carbon black filled NR-containing graphene nanoparticles (GNPs) were found to improve the dielectric properties and microwave properties, viz., coefficient of absorption and reflection of the electromagnetic waves and electromagnetic interference shielding effectiveness. Stiffness improvement by thermally reduced graphene oxide (TRG) was found to be more pronounced for elastomers [8], such as NR and styrene butadiene rubber (SBR), due to the higher stiffness between the matrix and the filler.…”

Section: Introductionmentioning

confidence: 99%

Non-linear Viscoelastic Behaviour of Rubber-Rubber Blend Composites and Nanocomposites: Effect of Spherical, Layered and Tubular Fillers

Nair

George

Joseph

2014

Advances in Polymer Science

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This chapter deals with the non-linear viscoelastic behaviour of rubberrubber blend composites and nanocomposites with fillers of different particle size. The dynamic viscoelastic behaviour of the composites has been discussed with reference to the filler geometry, distribution, size and loading. The filler characteristics such as particle size, geometry, specific surface area and the surface structural features are found to be the key parameters influencing the Payne effect. Non-linear decrease of storage modulus with increasing strain has been observed for the unfilled vulcanizates. The addition of spherical or near-spherical filler particles always increase the level of both the linear and the non-linear viscoelastic properties. However, the addition of high-aspect-ratio, fiber-like fillers increase the elasticity as well as the viscosity.

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Section: Introductionmentioning

confidence: 99%

Non-linear Viscoelastic Behaviour of Rubber-Rubber Blend Composites and Nanocomposites: Effect of Spherical, Layered and Tubular Fillers

Nair

George

Joseph

2014

Advances in Polymer Science

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“…First Omar et al [21] have reported microwave studies based on carbon black and graphene filled natural rubber composites and they limited the frequency region up to 12 GHz. They used graphene from Hayzen Engineering Co. Ankara, and the maximum amount incorporated was 10 wt%.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of graphite-graphene-ionic liquid modified carbon nanotubes filled natural rubber thin films for microwave and energy storage applications

et al. 2015

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Exploiting polymer nanocomposites as dielectric and heat storage devices is an important approach to develop high performance materials. Graphite (GT), thermally reduced graphene oxide (TRG), and hybrid consisting of TRG and ionic liquid (1-Ethyl-2, 3-dimethylimidazolium bis (trifluoromethylsulfonyl) imide) modified carbon nanotubes (IMCNT) were added to natural rubber and membranes were fabricated via melt mixing method. The amount of the GT, TRG, TRG+IMCNT used in this work was in the range of 0.5 to 5 wt%. Mechanical properties of NR nanocomposites revealed that the hybrid (TRG+IMCNT) (5 wt%) system showed high tensile strength, high modulus and low elongation at break as compared to neat NR, NR reinforced with GT (5 wt%) and NR reinforced with TRG (5 wt%) systems owing to the synergistic hybrid effect caused by the network formation of the hybrid fillers inside NR matrix. Dielectric properties of the prepared membranes were studied at 2.5, 10 and 20 GHz in the microwave frequency region using a Split Post Dielectric Resonator (SPDR) based technique. The incorporation of micro and nanofillers in the natural rubber (NR) matrix results in consistent improvement in dielectric constant and lower loss tangent values. In certain cases the samples containing 5 wt% of filler exhibited high loss or conducting behaviour at higher frequencies (10 and 20 GHz). Different techniques had to be employed for measuring the dielectric constant and loss tangent of the prepared membranes where they showed a high loss or conducting behaviour. Moreover, thermal history like glass transition temperature and the change in heat capacity were estimated using Differential Scanning Calorimetry (DSC). In addition, the dispersion of micro and nanofillers inside the NR was estimated using X-ray followed by Transmission Electron Microscopy for the morphology architecture of nanofillers. The morphology of the prepared membranes was correlated with the mechanical, dielectric and thermal properties. The hybrid system (TRG+IMCNT) exhibited high dielectric constant (5.6) and low heat capacity value (0.32 J/g/°C) as compared to GT and TRG systems.

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“…[10][11][12][13] However, to achieve a higher dielectric constant, a large amount of ceramic fillers (the concentration of the ceramic fillers is often over 50 vol.%) needs to be filled into the polymer matrix, which will dramatically increase the dielectric losses and brittleness of the composites. Therefore, polymer/modified conductive fillers (such as carbon black, 14 carbon nanotubes, 15,16 graphene, 17,18, etc.) composites have been identified as a promising approach to achieve the combination of the two outstanding dielectric and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Composites Based on Core–Shell Structured HBCuPc@CNTs-Fe3O4 and Polyarylene Ether Nitriles with Excellent Dielectric and Mechanical Properties

Zhong

Liu

2017

Journal of Elec Materi

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Core-shell structured magnetic carbon nanotubes (CNTs-Fe 3 O 4 ) coated with hyperbranched copper phthalocyanine (HBCuPc) (HBCuPc@CNTs-Fe 3 O 4 ) hybrids were prepared by the solvent-thermal method. The results indicated that the HBCuPc molecules were decorated on the surface of CNTs-Fe 3 O 4 through coordination behavior of phthalocyanines, and the CNTs-Fe 3 O 4 core was completely coaxial wrapped by a functional intermediate HBCuPc shell. Then, polymer-based composites with a relatively high dielectric constant and low dielectric loss were fabricated by using core-shell structured HBCuPc@CNTs-Fe 3 O 4 hybrids as fillers and polyarylene ether nitriles (PEN) as the polymer matrix. The cross-sectional scanning electron microscopy (SEM) images of composites showed that there is almost no agglomeration and internal delamination. In addition, the rheological analysis reveals that the core-shell structured HBCuPc@CNTs-Fe 3 O 4 hybrids present better dispersion and stronger interface adhesion with the PEN matrix than CNTs-Fe 3 O 4 , thus resulting in significant improvement of the mechanical, thermal and dielectric properties of polymer-based composites.

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Dielectric and Microwave Properties of Graphene Nanoplatelets /Carbon Black Filled Natural Rubber Composites

Cited by 35 publications

References 34 publications

Non-linear Viscoelastic Behaviour of Rubber-Rubber Blend Composites and Nanocomposites: Effect of Spherical, Layered and Tubular Fillers

Non-linear Viscoelastic Behaviour of Rubber-Rubber Blend Composites and Nanocomposites: Effect of Spherical, Layered and Tubular Fillers

Fabrication of graphite-graphene-ionic liquid modified carbon nanotubes filled natural rubber thin films for microwave and energy storage applications

Composites Based on Core–Shell Structured HBCuPc@CNTs-Fe3O4 and Polyarylene Ether Nitriles with Excellent Dielectric and Mechanical Properties

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